Is Epaminoda's Ring worth using for Upheaval? I'm on the fence about it. 5 WSD is nice but it comes with Store TP -10. Regal and Niqmaddu have great stats. Looking at the WS damage on the spreadsheet (the only thing I used these for) showed average WS damage go down when swapping out Niqmaddu. WS damage went up slightly when swapping out Regal although I forced attack/accuracy capped situations. The overall DPS went down (I'm guessing because of the STP -10). That said it's a spreadsheet.
I feel like they can be close for Upheaval and Torcleaver.
Epa hands down if the store TP will be a factor.
Regal for single hit WS with lower delay weapons (Torcleaver or Scourge with Calad/Rag)
I figure it this way, though my logic is probably flawed for Upheaval.
10 VIT= 2 WSDMG
10 STR= 1.25-1.5% WSDMG on Upheaval/Torcleaver since fSTR helps.
10 DEX= .25% WSDMG with Utu Grip. Not to mention a boost to accuracy.
Attack+ Helps if uncapped as well.
You also have the set effect/accuracy as a boost.
Store TP= Neutral compared to Epa. This means you can probably wear some more Double Attack gear.
Thoughts?